Khan Academy Static

Topic E includes lessons 15-17 and covers reading expressions in which letters stand for numbers and writing expressions in which letters stand for numbers.

9115_Writing_expressions_with_variables_parentheses.html

9114_Writing_expressions_with_variables.html

9116_Writing_basic_expressions_word_problems.html

9117_Writing_expressions_word_problems.html

9113_Why_aren_t_we_using_the_multiplication_sign_.html

9112_Writing_basic_expressions_with_variables.html